The synthesis of 13-hydroxylated ent-kaur-16-ene derivatives using an acyloin-like cyclization of keto esters
作者:I.F. Cook、J.R. Knox
DOI:10.1016/0040-4020(76)80050-6
日期:1976.1
The synthesis of steviol (27) and two A-ring modified analogues (9 and 15) is described. The synthetic sequences involve the preparation of suitably constituted 17-nor-13,16-seco-ent-kauranoid ketoesters (22, 7 and 13) which are then cyclized to 13,16-dooxygenated-17-nor-ent-kauranes (23, 8 and 14).
描述了甜菊醇(27)和两个A环修饰的类似物(9和15)的合成。该合成序列涉及适当地制备构成17去甲13,16-seco- ENT -kauranoid酮酯(22,7和13),其然后环化成13,16-dooxygenated -17-去甲ENT -kauranes(23、8和14)。
Gibberellin metabolites from ent-kaura-2,16-dien-19-ol and its succinate in Gibberella fujikuroi
作者:H.J. Bakker、I.F. Cook、P.R. Jefferies、J.R. Knox
DOI:10.1016/s0040-4020(01)97047-4
日期:1974.1
Exposure of ent-kaura-2,16-dien-19-ol (1) or its succinate (2) to resuspended mycelia of G. fujikuroi has produced a complex mixture of acids which after methylation gave the esters of two C19 (24) and (30) and five C20 gibberellins (4, 11, 20, 32 and 33). The triester (32) and the lactone ester (24) have been prepared before from the esters of gibberellin A13 (8) and gibberellin A4 (26) respectively
Acidic ent-kauranoids from the metabolism of ent-kaura-2,16-dien-19-ol in gibberella fujikuroi
作者:I.F. Cook、P.R. Jefferies、J.R. Knox
DOI:10.1016/0040-4020(75)85075-7
日期:1975.1
Three acidicent-kauranoid metabolites have been obtained as the methyl esters (7, 8, and 9) from incubation of the [17-14C]-labelled dienol (1) with Gibberellafujikuroi. Spectroscopic studies of the triol ester (7) and chemical degradation of B-ring cleaved products establish the assigned structure (7). The structures of the other two metabolite esters are indicated to be 8 and 9 from the spectroscopic